On 28/02/2012 15:56, Johan Tibell wrote:
On Tue, Feb 28, 2012 at 1:11 AM, Simon Marlow<[email protected]> wrote:
I think there are some in GHC - I've been surprised occasionally when adding
an UNPACK makes things worse.
I just realized that there is a failure mode I didn't quite consider:
having a mix of strict and non-strict primitive fields. While this can
happen on purpose, I think it happens more often due to non-strict
being the default. Having a field with such a mix might lead to more
re-boxing.
(I think you meant "record", not "field" in the last sentence, right?)
It's not obvious to me why having a mixture of strict and nonstrict
(maybe you meant UNPACKed and not UNPACKed?) fields would make things
worse. Could you give a concrete example?
Cheers,
Simon
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